Answer with explanation:

Number 10, is not Square of any Integer.
So, we can't say with surety that this expression is difference of squares.

The Binomial expression has two terms , which are perfect Squares.So, it is difference of squares.
![3.\rightarrow 8x^2 - 40 x + 25\\\\=8 \times (x^2-5 x+3)+1\\\\=8 \times [(x-\frac{5}{2})^2-\frac{25}{4}+3]+1\\\\=8 \times [(x-\frac{5}{2})^2-\frac{13}{4}]+1\\\\=8 \times [(x-\frac{5}{2})^2]-\frac{13}{4}\times 8+1\\\\=8 \times [(x-\frac{5}{2})^2]-25\\\\=[2\sqrt{2}(x-\frac{5}{2})]^2-(5)^2](https://tex.z-dn.net/?f=3.%5Crightarrow%208x%5E2%20-%2040%20x%20%2B%2025%5C%5C%5C%5C%3D8%20%5Ctimes%20%28x%5E2-5%20x%2B3%29%2B1%5C%5C%5C%5C%3D8%20%5Ctimes%20%5B%28x-%5Cfrac%7B5%7D%7B2%7D%29%5E2-%5Cfrac%7B25%7D%7B4%7D%2B3%5D%2B1%5C%5C%5C%5C%3D8%20%5Ctimes%20%5B%28x-%5Cfrac%7B5%7D%7B2%7D%29%5E2-%5Cfrac%7B13%7D%7B4%7D%5D%2B1%5C%5C%5C%5C%3D8%20%5Ctimes%20%5B%28x-%5Cfrac%7B5%7D%7B2%7D%29%5E2%5D-%5Cfrac%7B13%7D%7B4%7D%5Ctimes%208%2B1%5C%5C%5C%5C%3D8%20%5Ctimes%20%5B%28x-%5Cfrac%7B5%7D%7B2%7D%29%5E2%5D-25%5C%5C%5C%5C%3D%5B2%5Csqrt%7B2%7D%28x-%5Cfrac%7B5%7D%7B2%7D%29%5D%5E2-%285%29%5E2)
Number , 8 is not perfect Square.So, we can't say with surety , it is not difference of squares.
![4\rightarrow 64x^2 - 48 x + 9\\\\=64\times(x^2-\frac{48x}{64}+\frac{9}{64})\\\\=64\times(x^2-\frac{3x}{4}+\frac{9}{64})\\\\=64 \times [(x-\frac{3}{8})^2-(\frac{3}{8})^2+\frac{9}{64}]\\\\=64 \times (x-\frac{3}{8})^2](https://tex.z-dn.net/?f=4%5Crightarrow%2064x%5E2%20-%2048%20x%20%2B%209%5C%5C%5C%5C%3D64%5Ctimes%28x%5E2-%5Cfrac%7B48x%7D%7B64%7D%2B%5Cfrac%7B9%7D%7B64%7D%29%5C%5C%5C%5C%3D64%5Ctimes%28x%5E2-%5Cfrac%7B3x%7D%7B4%7D%2B%5Cfrac%7B9%7D%7B64%7D%29%5C%5C%5C%5C%3D64%20%5Ctimes%20%5B%28x-%5Cfrac%7B3%7D%7B8%7D%29%5E2-%28%5Cfrac%7B3%7D%7B8%7D%29%5E2%2B%5Cfrac%7B9%7D%7B64%7D%5D%5C%5C%5C%5C%3D64%20%5Ctimes%20%28x-%5Cfrac%7B3%7D%7B8%7D%29%5E2)
This expression is perfect Square number,not Difference of Squares.
⇒⇒Most Appropriate expression which is difference of squares
Option B
